Some of the panels may be "tabbed" or "pinned" together to allow for better protection and packaging preparation. THIS IS NORMAL
To separate panels simply break apart at the panel edge seams.
Some times a small remnant of material is left where the pinning breaks are on the panels. These can very easily be removed with a hobby knife or flush cutters.
FOR MDF VERSION: If you are concerned by the aesthetic of the small "pinning" tabs that you have trimmed you may very easily darken their edge to match the finished cut char with a black felt marker.
Its a good idea to take the time and inspect the panels now to make sure all hole cuts and waste pieces from fabrication are removed and cleaned up. Doing so will get you tighter seams where panel joints come together.
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